CN110566630B - Load supporting device integrating vibration reduction of launching section and vibration isolation of on-track section - Google Patents
Load supporting device integrating vibration reduction of launching section and vibration isolation of on-track section Download PDFInfo
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- CN110566630B CN110566630B CN201910683146.3A CN201910683146A CN110566630B CN 110566630 B CN110566630 B CN 110566630B CN 201910683146 A CN201910683146 A CN 201910683146A CN 110566630 B CN110566630 B CN 110566630B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/046—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means using combinations of springs of different kinds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M5/00—Engine beds, i.e. means for supporting engines or machines on foundations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/06—Stiffness
- F16F2228/066—Variable stiffness
Abstract
The invention provides a load supporting device integrating emission section vibration reduction and on-rail section vibration isolation, which can meet the variable stiffness requirements of high stiffness and high damping of an emission section and low stiffness and low damping of an on-rail section, realizes the integration of the emission section vibration reduction and on-rail section vibration isolation functions, and has high reliability. The vibration isolation device comprises a load platform, a vibration isolation module and a connecting and supporting module. The upper end and the lower end of the vibration isolation module are respectively connected with the load platform and the connecting and supporting module, and the vibration isolation module is of a closed parallel structure, so that the requirements of large bearing and high reliability of the launching section on a mechanical environment can be met; meanwhile, the design of symmetrical and inclined supports is adopted, the functions of three-dimensional equal rigidity and equal fundamental frequency under a space coordinate system are realized, and the stability is better. The variable stiffness design requirement is realized by bidirectionally adjusting the compression amount of the rubber vibration isolation assembly, and the rubber vibration isolation assembly has stronger adaptability to complex space mechanical environments. The supporting device has the advantages of light weight, small size, simple structure, low manufacturing cost and wide application prospect.
Description
Technical Field
The invention relates to a load supporting device, in particular to a load supporting device for integrating an anti-mechanical environment and on-orbit vibration isolation in a spacecraft, and belongs to the technical field of vibration reduction and isolation of spacecrafts.
Background
With the rapid development of spacecraft technology, the precision, sensitivity and complexity of a spacecraft payload are continuously improved, on one hand, in the launching stage, the vibration magnitude of the payload installation part needs to be reduced, and the damage of the high-precision payload caused by the vibration environment caused by a rocket is prevented; on the other hand, in the on-orbit working stage, the micro-vibration interference generated by the on-board moving parts (such as a control moment gyro, a reaction wheel, a sun wing driving mechanism and the like) needs to be reduced, and the precision of the effective load is ensured to meet the requirement.
The engineering usually adopts special load supporting devices to meet the above requirements, but the two requirements have certain contradiction to the requirements of the load supporting devices. For the vibration reduction requirement of the launching section, the load supporting device needs to have higher damping, reduce the vibration magnitude of the launching section through the damping effect and also need to have higher rigidity, so that the resonance coupling with the spacecraft structure is avoided, and the bearing capacity of the load supporting device is improved. For the requirement of vibration isolation of the on-track section, the load supporting device needs to have lower damping to avoid too much damping to reduce vibration isolation efficiency, and simultaneously needs to have lower frequency, so that the vibration excitation frequency of a disturbance source is avoided, and the effect of vibration isolation of medium and high frequency bands is improved. The conflicting requirements of the two aspects create significant difficulties in the design of the load support apparatus.
At present, relevant patents of the vibration reduction and isolation device of the spacecraft are as follows: (1) a parallel truss type CMG group vibration reduction and isolation device adopts a plurality of vibration isolation rods to be combined in parallel, realizes the overall vibration isolation of a plurality of CMGs in a truss layout mode, and realizes the adjustment of the characteristics of a vibration isolation system by adjusting the layout angle of the vibration isolation rods and the rigidity and damping parameters of vibration isolators so as to adapt to the CMG vibration reduction and isolation requirements of different models (patent number ZL 201610329702.3); (2) a micro-amplitude high-bearing high-damping micro vibration isolator adopts an external main stiffness spring and an internal fluid damper which are connected in parallel, realizes high sensitivity to micro vibration, and effectively improves micro-vibration and high-precision spacecraft on-orbit vibration control (application number 201618001923.9); (3) an active-passive integrated four-foot convergent vibration isolator adopts three-foot inclined support, improves the bearing capacity by adding piezoelectric ceramics, a vibration isolation spring and metal rubber in parallel connection, and has better function of inhibiting a resonance peak (application number CN 201810057862.6); (4) a three-way rigidity adjustable vibration isolator realizes the adjustment of self rigidity by adjusting the radial and axial distances between eight bow-shaped spring pieces which are symmetrical up and down and a central screw rod, can use different vibration working condition requirements and has a wider vibration environment application range (application number 201710560814.4); (5) a variable rigidity vibration isolator, which is used for vibration isolation or vibration reduction through the rigidity change in the shearing direction of a magnetorheological elastomer, so that the vibration isolator can achieve a better vibration reduction effect under the condition that the vibration source frequency is continuously changed (application number CN 201120115405.1); (6) the variable stiffness adjustment type rubber vibration isolator changes the stiffness and the natural frequency of the rubber vibration isolator by adjusting the pre-tightening force on rubber through a clamping mechanism (application number CN 200720076571.9); (7) a variable-stiffness anti-impact steel wire rope vibration isolator realizes the variable-stiffness function and the variable natural frequency characteristic by adjusting the distance between a spiral spring and a rubber guide post (application number CN 201210449630.8); (8) the patent: the utility model provides a can reduce vibration isolation unit module of nonlinear effect adopts "S" type structure and shakes source and base member and be connected to set up the rubber pad in its interval, can effectively reduce the vibration transmission, have better bearing capacity (application number US 201415033600).
The vibration isolation device designed by the patent is beneficial to realizing high bearing, has better mechanical environment resistance and good high-frequency vibration isolation effect, can inhibit the peak response of a resonance frequency band, still has some unknown parts, and is specifically shown in the following steps:
(1) the bearing capacity is singly improved, the variable rigidity cannot be considered, and the application environment is limited. Although the traditional vibration isolator adopts the vibration isolation spring and the rubber which are connected in parallel to increase the bearing capacity of the vibration isolator, the variable stiffness adjustment cannot be realized, so that the adjustment of the natural frequency cannot be realized under a complex mechanical environment, and the application environment is limited. While the adaptability can be effectively improved by adding an active control link to realize the functions of variable rigidity and variable damping, the complexity of the system is increased, and the reliability is reduced.
(2) The low-order natural frequency distribution is scattered, and the vibration reduction and isolation effect is not ideal. Aiming at a complex space mechanics environment, all external interference frequency points and effective load working interference frequency points need to be avoided by the low-order natural frequency of the vibration isolation device. The existing vibration isolator cannot effectively avoid the interference frequency points because the inherent frequency distribution of the existing vibration isolator is scattered, and is easy to generate coupling resonance with the whole satellite structure and the effective load. The ideal vibration isolation device can realize equal-rigidity and equal-frequency design, and is distributed and concentrated to easily avoid resonance points.
Disclosure of Invention
In view of this, the invention provides a load supporting device integrating emission section vibration reduction and on-rail section vibration isolation, which can meet the variable stiffness requirements of high stiffness and high damping of the emission section and low stiffness and low damping of the on-rail section, and realize the integration of the emission section vibration reduction and on-rail section vibration isolation functions, and has high reliability.
The load supporting device integrating the vibration reduction of the launching section and the vibration isolation of the on-rail section comprises: the vibration isolation device comprises a load platform, a vibration isolation module and a connecting support module;
the vibration isolation module is arranged between the load platform and the connecting and supporting module, and comprises: more than three variable stiffness vibration isolators;
the variable stiffness vibration isolator comprises: a spring vibration isolation assembly and a rubber vibration isolation assembly; the spring vibration isolation assembly includes: the end cover, the limiting cylinder I, the spiral spring and the limiting cylinder II; the limiting cylinder I and the limiting cylinder II are coaxially and oppositely arranged, and a gap with a set distance is formed between opposite surfaces; the end cover is in threaded connection with the opening end of the limiting cylinder I; the spiral spring is sleeved outside the limiting cylinder I and the limiting cylinder II, and two ends of the spiral spring are connected with the limiting cylinder I and the limiting cylinder II through fasteners respectively;
the rubber vibration isolation assembly includes: two rubber pads, a piston rod and a limit nut; one end of the piston rod is coaxially positioned in the limiting cylinder I, and the other end of the piston rod penetrates through the limiting cylinder I and extends into the limiting cylinder II 39; the middle part of the piston rod, which is positioned in the limiting cylinder I, is provided with a shaft shoulder, the shaft shoulder divides the inner space of the limiting cylinder I into an upper part and a lower part, and rubber pads are respectively arranged in the upper part and the lower part; the part of the piston rod extending into the limiting cylinder II is connected with a limiting nut through threads, and the limiting nut is abutted against the inner bottom surface of the limiting cylinder II;
the length of the end cover in threaded fit with the limiting cylinder I is adjusted, and the compression amount of the rubber pad in the upper space in the limiting cylinder I can be adjusted; the length of the limiting nut in threaded fit with the piston rod is adjusted, and the compression amount of the rubber pad in the upper space in the limiting cylinder I can be adjusted.
Preferably: the normal direction of the upper surface of the connecting and supporting module is an x direction, the left and right direction in the upper surface of the connecting and supporting module is a y direction, and the direction vertical to the xy plane is a z direction;
the three or more variable stiffness vibration isolators are obliquely arranged, so that the stiffness components of the vibration isolation modules in the x, y and z directions are the same.
Preferably: the axes of more than three variable stiffness vibration isolators intersect at the center of mass of the load platform.
Preferably: the vibration isolation module includes: the four variable-stiffness vibration isolators are grouped in pairs and are distributed between the load platform and the connecting and supporting module in bilateral symmetry;
the variable stiffness vibration isolator is arranged in an inward inclined mode, and the included angle between the axis of the variable stiffness vibration isolator and the y direction is beta;
the two variable stiffness vibration isolators in each group are obliquely arranged towards the opposite direction, and the included angle between the axes of the two variable stiffness vibration isolators in each group is alpha;
the values of the included angle beta and the included angle alpha ensure that the rigidity components of the vibration isolation module in the x direction, the y direction and the z direction are the same.
Has the advantages that:
(1) the spring vibration isolation assembly and the rubber vibration isolation assembly adopt a closed parallel connection design, and the requirements of large bearing and high reliability in a mechanical environment are effectively met. Through the double space cooperation of limiting cylinder I and piston rod, not only can effectively improve rigidity, increase its bearing capacity in the resistance chemical environment of launching section, help reducing launching section vibration response peak value moreover, improve rubber vibration isolation subassembly in-orbit operational environment demand.
(2) The compression amount of the rubber vibration isolation assembly can be adjusted in two directions, the variable stiffness design requirement is met, and the adaptability is stronger. Through adjusting end cover and spacing section of thick bamboo I to and the screw-thread fit length of piston rod and stop nut, the compression state of upper and lower two-layer rubber pad can be adjusted to realize the variable rigidity of vibration isolation module and adjust, thereby increase the flexibility of keeping away all external disturbance frequency points and payload, the adaptability to complicated space mechanics environment is stronger.
(3) The design of symmetrical distribution and inclined support is carried out aiming at the variable-stiffness vibration isolator, and the design requirement of three-dimensional equal stiffness under a space coordinate system can be met; the supporting device has the advantages that the plurality of variable stiffness vibration isolators are uniformly and symmetrically supported below the load platform, the axes of the plurality of variable stiffness vibration isolators are intersected at the center of mass of the load platform, the three-direction fundamental frequency equivalence of the supporting device is easy to realize, the low-order natural frequency distribution is compact, external numerous interference frequency points and working interference frequency points of the effective load can be effectively avoided, and the stability is better.
Drawings
FIG. 1 is an overall structure view of the on-orbit vibration isolation integrated high-load-bearing supporting device of the invention;
FIG. 2 is a sectional view of the vibration isolation module structure of the supporting device of the present invention;
FIG. 3 is a top view of the vibration isolation module structure of the supporting device of the present invention;
fig. 4 is a schematic view of the inclination angle and arrangement of the connecting and supporting module of the supporting device of the present invention.
Wherein: a-load platform, B-vibration isolation module, C-connection support module, D-spring vibration isolation assembly, E-rubber vibration isolation assembly, 1-load mounting plate, 2-upper bracket, 3-variable stiffness vibration isolator, 4-lower bracket, 5-base, 31-end cover, 32-positioning screw, 33-limiting cylinder I, 34-rubber pad, 35-piston rod, 36-inner limiting nut, 37-outer limiting nut, 38-spiral spring and 39-limiting cylinder II.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The embodiment provides a load supporting device integrating emission section vibration reduction and on-orbit section vibration isolation, and aims to solve the problems that the existing vibration isolation device is wide in low-order modal distribution and easy to generate resonance coupling with a spacecraft structure; meanwhile, in order to solve the problems that the rigidity of the existing passive vibration isolator cannot be adjusted, and the rigidity adjusting mode of the active vibration isolator is complex and low in reliability, the passive variable-rigidity design is adopted, and the variable-rigidity requirements of high rigidity and high damping of the launching section and low rigidity and low damping of the on-rail section are met through the bidirectional adjusting design.
As shown in fig. 1, the load supporting apparatus includes: the vibration isolation device comprises a load platform A, a vibration isolation module B and a connecting and supporting module C. The load platform a includes: the device comprises a load mounting plate 1 and an upper bracket 2, wherein the upper bracket 2 is connected to the lower surface of the load mounting plate 1 through a fastener (such as a screw), and the upper surface of the load mounting plate 1 is used as a load mounting surface; the connection support module C includes: a lower bracket 4 and a base 5, wherein the lower bracket 4 is connected to the upper surface of the base 5 through a fastener (such as a screw); the vibration isolation module B is positioned between the load platform A and the connecting and supporting module C, and the upper end and the lower end of the vibration isolation module B are respectively connected with the upper bracket 2 and the lower bracket 4 through fasteners (such as screws), so that the reliable connection of the vibration isolation module B is ensured.
The vibration isolation module B is composed of more than two groups of variable stiffness vibration isolators 3, and in the present embodiment, the vibration isolation module B is composed of four groups of variable stiffness vibration isolators 3 (corresponding to the load platform a having four upper brackets 2, and the connection support module C having four lower brackets 4). As shown in fig. 2 and 3, the variable stiffness vibration isolator 3 includes two parts, a spring vibration isolation assembly D and a rubber vibration isolation assembly E. The rubber vibration isolation assembly E is located in the closed space inside the spring vibration isolation assembly D, the on-orbit working environment of the rubber vibration isolation assembly E is guaranteed, and the influence of the severe environment in the space on the working performance of the rubber vibration isolation assembly E is prevented.
Wherein, spring vibration isolation subassembly D includes: end cap 31, spacing section of thick bamboo I33, coil spring 38 and spacing section of thick bamboo II 39. The limiting cylinder I33 and the limiting cylinder II39 are both of a cylindrical structure with an opening at one end and a through hole at one end, and shaft shoulders are arranged at the opening ends of the limiting cylinder I33 and the limiting cylinder II 39; the end cover 31 is in threaded connection with the open end of the limiting cylinder I33 and closes the open end of the limiting cylinder I33; the limiting cylinder I33 and the limiting cylinder II39 are coaxially arranged, the opening end of the limiting cylinder I33 faces upwards, one end provided with a through hole is opposite to one end provided with a through hole of the limiting cylinder II39, and a gap with a set distance is formed between the opposite surfaces; the spiral spring 38 is sleeved outside the limiting cylinder I33 and the limiting cylinder II39, and two ends of the spiral spring are respectively connected with shaft shoulders at the opening ends of the limiting cylinder I33 and the limiting cylinder II39 through fasteners (such as screws). The relative position on the shaft shoulder of spacing section of thick bamboo I33 and spacing section of thick bamboo II39 open end respectively sets up a set screw 32, makes things convenient for it to realize effective location in the installation.
The rubber vibration isolating assembly E includes: a rubber pad 34, a piston rod 35, an inner limit nut 36 and an outer limit nut 37; one end of the piston rod 35 is coaxially positioned in the limiting cylinder I33, and the other end of the piston rod sequentially penetrates through via holes at the ends of the limiting cylinder I33 and the limiting cylinder II39 and is positioned in the limiting cylinder II 39; the part of the piston rod 35 located inside the limiting cylinder I33 is in a cross-shaped structure, namely, a shaft shoulder is processed in the middle of the piston rod 35 located inside the limiting cylinder I33, the shaft shoulder divides the internal space of the limiting cylinder I33 into an upper part and a lower part, a rubber pad 34 is respectively installed in the upper part and the lower part, and the rubber pad 34 is compacted through an end cover 31. The piston rod 35 passes the one end of spacing section of thick bamboo II39 tip via hole and has the external screw thread, be provided with outside stop nut 37 and inboard stop nut 36 with the external screw thread fit on the piston rod 35 respectively in the outside and the inboard of spacing section of thick bamboo II39 via hole, screw up the piston rod 35 in spacing section of thick bamboo II39 through inboard stop nut 36 and outside stop nut 37, wherein outside stop nut 37 and inboard stop nut 36 can adopt two nuts to loosen or the coating screw thread anti-loosening glue, prevent to take place to become flexible in the use. In order to facilitate the assembly and debugging of the piston rod 35, a straight groove for matching with an external tool (such as a screwdriver) is processed on the end face of the piston rod 35 extending into the end of the limiting cylinder II39, and when the outer limiting nut 37 and the inner limiting nut 36 are installed and the threaded connection length of the outer limiting nut 37 and the piston rod 35 is adjusted, the screwdriver is matched with the straight groove at the end of the piston rod 35 to prop against the piston rod 35, so that the piston rod 35 does not rotate along with the nut.
By adjusting the length of the end cover 31 in threaded fit with the limiting cylinder I33 and the length of the piston rod 35 in threaded fit with the limiting nut, the compression states of the upper rubber pad and the lower rubber pad can be adjusted, and the variable stiffness adjusting effect of the vibration isolation module is achieved.
In order to facilitate the observation of the compression state of the rubber pad in the limiting cylinder I33 during installation, a through hole is processed on the outer circumferential surface of the limiting cylinder I33 to serve as an observation window.
As shown in fig. 4, a space coordinate system is established by setting the normal direction of the upper surface of the base as the x direction, the left and right directions in the upper surface of the base as the y direction, and the direction perpendicular to the xy plane as the z direction; in order to realize the three-direction equal-rigidity design, namely the rigidity components of the variable-rigidity vibration isolator 3 in the x, y and z directions are the same, the following arrangement mode is adopted for the variable-rigidity vibration isolator 3:
the variable stiffness vibration isolator 3 is connected between the lower support 4 and the upper support 2 corresponding to the variable stiffness vibration isolator through a fastener (such as a screw), wherein the connection surface of the lower support 4 and the variable stiffness vibration isolator 3 is an inclined surface A, the connection surface of the upper support 2 and the variable stiffness vibration isolator 3 is an inclined surface B parallel to the inclined surface A, and an included angle between the normal direction of the inclined surface A and the inclined surface B and the horizontal direction is beta. The axis of the variable stiffness vibration isolator 3 is parallel to the normal direction of the two inclined planes, so that the variable stiffness vibration isolator 3 has a certain inclination angle beta after being connected with the upper bracket 2 and the lower bracket 4, namely the variable stiffness vibration isolator 3 inclines inwards and upwards, and the included angle between the axis of the variable stiffness vibration isolator 3 and the horizontal direction is beta. The four variable stiffness vibration isolators 3 are distributed at four corners of the upper surface of the base 5 and are distributed in bilateral symmetry; the two variable stiffness vibration isolators 3 positioned on the same side (left side or right side) are inclined inwards, so that an included angle between the axes of the two variable stiffness vibration isolators 3 positioned on the same side (left side or right side) is alpha, and the stiffness components of the spiral spring 38 in the variable stiffness vibration isolators 3 in the three directions of x, y and z are the same through designing the angle value beta and the angle value alpha, so that the three-way equal stiffness design under a space coordinate system is realized, the low-order mode distribution of the supporting device is compact, the coupling resonance of an emission section and an on-rail section is effectively avoided, the axes of the four variable stiffness vibration isolators are preferably intersected at the mass center of the load platform, and the three-way fundamental frequency equivalence of the supporting device is easy to realize. The tilt angle value beta and the roll angle value alpha can be analyzed and designed according to the quality characteristics of the effective load so as to meet the functional requirements.
From this under the big vibration load effect of transmission section, through the millimeter level displacement of piston rod 35, realize two-way dynamic compression rubber, increase strutting arrangement's dynamic structure damping, a large amount of dissipation vibration energy, the good damping effect of transmission section is guaranteed to rapid attenuation vibration energy. In the rail section, the rubber vibration isolation assembly E is in a micro-vibration dynamic environment, the displacement of the piston rod 35 is generally in a micron order, the compression amount of rubber is extremely small, and no restoring force is generated generally, so that the frequency of the supporting device is reduced, and the high-frequency vibration isolation effect is improved.
The load supporting device is a variable-stiffness vibration isolation system, and can meet the requirements of different effective load launching sections on mechanical environment resistance and on-rail vibration isolation performance as long as relevant dimensions and technical parameters of a spring isolator vibration assembly and a rubber vibration isolation assembly, arrangement modes and inclination angles are adaptively modified, so that the variable-stiffness vibration isolation system has high universality and wide application prospect.
The modal and frequency response analysis and test of the load supporting device prove that the load supporting device achieves the high bearing capacity of the active section and the good vibration reduction effect of the on-track section, and can effectively avoid the coupling resonance of all external interference frequency points. Meanwhile, the load supporting device has the advantages of light weight, small size, simple structure, low manufacturing cost and good adaptability.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A load support device integrating vibration reduction of a launching section and vibration isolation of an on-rail section is characterized by comprising: the vibration isolation device comprises a load platform, a vibration isolation module and a connecting support module;
the vibration isolation module is arranged between the load platform and the connecting and supporting module, and comprises: more than three variable stiffness vibration isolators (3);
the variable stiffness vibration isolator (3) comprises: a spring vibration isolation assembly and a rubber vibration isolation assembly; the spring vibration isolation assembly includes: the device comprises an end cover (31), a limiting cylinder I (33), a spiral spring (38) and a limiting cylinder II (39); the limiting cylinder I (33) and the limiting cylinder II (39) are coaxially and oppositely arranged, and a gap with a set distance is formed between the opposite surfaces; the end cover (31) is in threaded connection with the opening end of the limiting cylinder I (33); the spiral spring (38) is sleeved outside the limiting cylinder I (33) and the limiting cylinder II (39), and two ends of the spiral spring are connected with the limiting cylinder I (33) and the limiting cylinder II (39) through fasteners respectively;
the rubber vibration isolation assembly includes: two rubber pads (34), a piston rod (35) and a limit nut; one end of the piston rod (35) is coaxially positioned in the limiting cylinder I (33), and the other end of the piston rod penetrates through the limiting cylinder I (33) and extends into the limiting cylinder II (39); the middle part of the piston rod (35) positioned in the limiting cylinder I (33) is provided with a shaft shoulder, the shaft shoulder divides the inner space of the limiting cylinder I (33) into an upper part and a lower part, and a rubber pad (34) is respectively arranged in the upper part and the lower part; the part of the piston rod (35) extending into the limiting cylinder II (39) is connected with a limiting nut through threads, and the limiting nut is abutted against the inner bottom surface of the limiting cylinder II (39);
the length of the end cover (31) in threaded fit with the limiting cylinder I (33) is adjusted, and the compression amount of a rubber pad (34) in the upper space in the limiting cylinder I (33) can be adjusted; the length of the limit nut in threaded fit with the piston rod (35) is adjusted, and the compression amount of a rubber pad (34) in the lower space in the limit cylinder I (33) can be adjusted, so that the variable rigidity is realized by adjusting the compression amount of the rubber vibration isolation assembly in a bidirectional mode;
the normal direction of the upper surface of the connecting and supporting module is an x direction, the left and right direction in the upper surface of the connecting and supporting module is a y direction, and the direction vertical to the xy plane is a z direction;
the vibration isolation module includes: the four variable stiffness vibration isolators (3) are grouped in pairs and symmetrically distributed between the load platform and the connecting and supporting module;
the variable stiffness vibration isolator (3) is arranged in an inward inclined mode, and the included angle between the axis of the variable stiffness vibration isolator and the y direction is beta;
the two variable stiffness vibration isolators (3) in each group are obliquely arranged towards the opposite direction, and the included angle between the axes of the two variable stiffness vibration isolators (3) in each group is alpha;
the values of the included angle beta and the included angle alpha ensure that the rigidity components of the vibration isolation module in the x direction, the y direction and the z direction are the same;
under the action of large vibration load of the launching section, the rubber pad is compressed in a bidirectional and dynamic mode through millimeter-scale displacement of the piston rod (35), so that vibration reduction is realized; in the rail section, the rubber vibration isolation assembly is in a micro-vibration dynamic environment, the displacement of the piston rod (35) is in a micron order, and the rubber pad has no restoring force, so that vibration isolation is realized.
2. The launch section vibration damping and on-track section vibration isolation integrated load support apparatus of claim 1, wherein: the axes of more than three variable stiffness vibration isolators (3) intersect at the center of mass of the load platform.
3. The launch section vibration damping and on-track section vibration isolation integrated load support apparatus of claim 1, wherein: the load platform includes: the variable stiffness vibration isolator comprises a load mounting plate (1) and an upper bracket (2), wherein the load mounting plate (1) provides a load mounting surface outwards, the upper bracket (2) corresponds to the variable stiffness vibration isolators (3) one by one, and the variable stiffness vibration isolators (3) are connected with the load mounting plate (1) through the upper bracket (2);
the connection surface of the upper support (2) and the variable stiffness vibration isolator (3) is an inclined surface B, and an included angle between the normal direction of the inclined surface B and the y direction is beta.
4. The launch section vibration damping and on-track section vibration isolation integrated load support apparatus of claim 1, wherein: the connection support module includes: the variable stiffness vibration isolator comprises a base (5) and a lower support (4), wherein the lower support (4) corresponds to the variable stiffness vibration isolators (3) one by one, and the variable stiffness vibration isolators (3) are connected with the base (5) through the lower support (4);
the connecting surface of the lower support (4) and the variable stiffness vibration isolator (3) is an inclined surface A, and an included angle between the normal direction of the inclined surface A and the y direction is beta.
5. The launch section vibration damping and on-track section vibration isolation integrated load support apparatus of claim 1, 2 or 3 wherein: and a positioning screw (32) is respectively arranged at the opposite positions on the end surfaces of the limiting cylinder I (33) and the limiting cylinder II (39).
6. The launch section vibration damping and on-track section vibration isolation integrated load support apparatus of claim 1, 2 or 3 wherein: the inner side and the outer side of the part, extending into the limiting cylinder II (39), of the piston rod (35) are respectively connected with a limiting nut through threads, namely an outer limiting nut (37) and an inner limiting nut (36); the outer side limiting nut (37) is abutted against the end face of the limiting cylinder II (39), and the inner side limiting nut (36) is abutted against the inner bottom face of the limiting cylinder II (39).
7. The launch section vibration damping and on-track section vibration isolation integrated load support apparatus of claim 1, 2 or 3 wherein: and a through hole is arranged on the outer circumferential surface of the limiting cylinder I (33) and is used as an observation window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910683146.3A CN110566630B (en) | 2019-07-26 | 2019-07-26 | Load supporting device integrating vibration reduction of launching section and vibration isolation of on-track section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910683146.3A CN110566630B (en) | 2019-07-26 | 2019-07-26 | Load supporting device integrating vibration reduction of launching section and vibration isolation of on-track section |
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